Question:Five bananas and four apples cost as much as three bananas and seven apples. The ratio of the cost of one banana to that of one apple is : 

A `3 : 2` 
B `4 : 3` 
C `3 : 4` 
D `1 : 3` 

+ Answer
A 

+ Explanation
Let the cost of each banana be `x` paise and that of each apple by `y` paise.

Then,

`5x + 4y = 3x + 7y `

`iff 2x = 3y`

`iff x/y = 3/2`.

`:.` Required ratio is `3 : 2`.

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Md. Habib Ullah

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